矩形截面木拉杆连接如图，这时接头处的挤压应力[img=22x17]1803d617883ec61.png[/img][img=299x134]1803d617931e58f.png[/img]
A: [img=53x44]1803d6179add363.png[/img]
B: [img=58x44]1803d617a37fe11.png[/img]
C: [img=59x44]1803d617acfdfc3.png[/img]
D: [img=62x44]1803d617b6ecd58.png[/img]
A: [img=53x44]1803d6179add363.png[/img]
B: [img=58x44]1803d617a37fe11.png[/img]
C: [img=59x44]1803d617acfdfc3.png[/img]
D: [img=62x44]1803d617b6ecd58.png[/img]
举一反三
- 矩形截面木拉杆连接如图，这时接头处的挤压应力[img=22x17]1803190d026ac8a.png[/img][img=299x134]1803190d0d36986.png[/img] A: [img=53x44]1803190d15be985.png[/img] B: [img=58x44]1803190d1e911d8.png[/img] C: [img=59x44]1803190d272dd01.png[/img] D: [img=62x44]1803190d2fcd12d.png[/img]
- 矩形截面木拉杆连接如图，这时接头处的挤压应力[img=22x17]1803238a69aeb5b.png[/img][img=299x134]1803238a752dae5.png[/img] A: [img=53x44]1803238a7e2877e.png[/img] B: [img=58x44]1803238a867aa21.png[/img] C: [img=59x44]1803238a8f94aec.png[/img] D: [img=62x44]1803238a989f99f.png[/img]
- 矩形截面木拉杆连接如图，这时接头处的切应力[img=299x134]1803190ce509e0e.png[/img] A: [img=53x44]1803190ceded75c.png[/img] B: [img=45x44]1803190cf6ee5cf.png[/img] C: [img=45x44]1803190cff5eb88.png[/img] D: [img=71x45]1803190d07b32be.png[/img]
- 设随机变量X,Y相互独立,且[img=167x27]17da6334a00d255.png[/img],[img=85x19]17da6334b1f3f8e.png[/img],则[img=55x27]17da6334bb9ebfa.png[/img]( ). A: 8 B: 16 C: 28 D: 44
- 令F(x):x是有理数,G(x):x是实数。将命题“所有的有理数都是实数,但有的有实数不是有理数”符号化为() 未知类型：{'options': ['17e0a83a4157352.jpgx(F(x)∧G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)[img=14x9]17e0a73094b5dcf.jpg[/img][img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)[img=14x9]17e0a73094b5dcf.jpg[/img]G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)∧[img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)∧G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)∧[img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)[img=14x9]17e0a73094b5dcf.jpg[/img]G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)[img=14x9]17e0a73094b5dcf.jpg[/img][img=10x11]17e0a839b915354.jpg[/img]F(x))'], 'type': 102}